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Re: mainframe faqs (DB2) (CICS) interview questions [by reddy chandrakanth]

Wed, 09 Jan 2008 11:15:07 +2230

Interview Questions:: mainframe faqs (DB2) (CICS) interview questions
The above questions are posted by ARC KANTH

Re: java,j2ee faq's best [by Ravikiran]

Sat, 05 Jan 2008 13:44:18 +2230

Interview Questions:: Java faq's (interview questions)
What is meant by compatible equals() and hashCode() methods?

In order for the Java Collections to work properly (and everything else in Java), the equals() and hashCode() methods must be compatible.Here, compatible means that if equals() reports that two instances are the same, then the hashCode() of both instances must be the same value.
The default hashCode() method uses the 32-bit internal JVM address of the Object as its hashCode. However, if the Object is moved in memory during garbage collection, the hashCode stays constant. This default hashCode is not very useful, since to look up an Object in a HashMap,you need the exact same key Object by which the key/value pair was
originally filed. Normally, when you go to look up, you don't have the original key Object itself, just some data for a key. So, unless your key is a String, nearly always you will need to implement a hashCode and equals method on your key class. The Gemini Twins: equals and hashCode
The default hashCode just uses the address of the Object and the default equals method just compares addresses. If you override one of these two methods, you must override the other to match. The rules are:
�It is ok, but not desirable, if two Objects that do not
compare equal have the same hashCode.
�Two Objects that compare equal must have the same hashCode.
So if you had a Fruit Object with a flavour and colour field, and you decided that any two Objects with the same flavour were for all intents and purposes equal, you would define your equals and hashCode methods like this:

What are all the classes in JDBC APi ?
DriverManager The basic service for managing a set of JDBC drivers.
NOTE: The DataSource interface, new in the JDBC 2.0 API, provides another way to connect to a data source.
SQLException An exception that provides information on a database access error or other errors. SQLWarning
An exception that provides information on database access warnings.

When To Use Interfaces
An interface allows somebody to start from scratch to implement your interface or implement your interface in some other code whose original or primary purpose was quite different from your interface. To them, your interface is only incidental, something that have to add
on to the their code to be able to use your package.
When To Use Abstract classes An abstract class, in contrast, provides more structure. It usually
defines some default implementations and provides some tools useful for a full implementation. The catch is, code using it must use your class as the base. That may be highly inconvenient if the other programmers wanting to use your package have already developed their own class hierarchy independently. In Java, a class can inherit from
only one base class. When to Use Both You can offer the best of both worlds, an interface and an abstract
class. Implementors can ignore your abstract class if they choose.The only drawback of doing that is calling methods via their interface name is slightly slower than calling them via their abstract class name.

static synchronized method

Static synchronized methods have their monitor associated with the class itself. That's not fully precise but it'll suffice.Synchronized instance methods have their monitor associated with the instance Object. Two monitors (the very small toilets) cannot be owned (be synchronized upon) by two different threads at the same time, even when bare need is at hand (beershit or the like). This means that: when a Thread enters a static synchronized method of a given class, then no other Thread can enter another static
synchronized method of that class. But other threads might execute any non-synchronized method, or a synchronized instance method. public Class MyClass public static synchronized a(){} public static synchronized b() public synchronized c() When executing a static synchronized method, the lock is on the Class object (MyClass). Therefore, no other thread can execute any other static synchronized method since they all lock on the same class.
Only one thread at a time can execute an instance method that is synchronized from the same object.MyClass mc = new MyClass();
mc.c()
only one thread can execute the above c() at a time.
MyClass.a()
Only one thread can execute the a() OR the b() at a time.
A good example for using synchronized static methods is the singleton pattern. E.g. public class Singleton
{
private Singleton() {}
private static Singleton fgUniqueInstance;
public static synchronized Singleton getInstance( )
{
if (fgUniqueInstance= =null) {
fgUniqueInstance = new Singleton();
}
return fgUniqueInstance;
}
}

If you won't synchronize this class in a multi-threading environment,it could happen, that more than one instance is created.
So what does the static Thread.yield( ) have to do with all this? Not that much, in practice. What yield() is supposed to do is make the currently running thread head back to runnable to allow other threads of the same priority to get their turn. So the intention is to use yield() to promote graceful turn-taking among equal-priority threads. In reality, though, the yield() method isn't guaranteed to do what it claims, and even if yield() does cause a thread to step out of running and back to runnable, there's no guarantee the yielding thread won't just be chosen again over all the others! So while yield() might�and often does�make a running thread give up its slot to another runnable
thread of the same priority, there's no guarantee.
The Join() Method
The nonstatic join() method of class Thread lets one thread "join onto the end" of another thread. If you have a thread B that can't do
its work unt l another thread A has completed its work, then you want thread B to join" thread A. This means that thread B will not becomerunnable until A has finished (and entered the dead state).

Thread t = new Thread();
t.start();
t.join();

The preceding code takes the currently running thread (if this were in the main() method, then that would be the main thread) and joins it to the end of the thread referenced by t. This blocks the current thread from becoming runnable until after the thread referenced by t is no longer alive. You can also call one of the overloaded versions of join
that takes a timeout duration, so that you're saying, "wait until thread t is done, but if it takes longer than 5,000 milliseconds, then stop waiting and become runnable anyway."

The wait() method lets a thread say, "there's nothing for me to do here, so put me in your waiting pool and notify me when something happens that I care about." Basically, a wait() call means "wait me in your pool," or "add me to your waiting list."
All three methods�wait( )/notify( )/notifyAll( )�must be called from within a synchronized context! A thread invokes wait()/notify( ) on a particular object, and the thread must currently hold the lock on that object.

Can we Serialize static variable?

Answer: Serialization is the process of converting a set of object instances that contain references to each other into a linear stream of bytes, which can then be sent through a socket, stored to a file, or simply manipulated as a stream of data. Serialization is the mechanism used by RMI to pass objects between JVMs, either as arguments in a method invocation from a client to a server or as return values from a method invocation. In the first section of this book, There are three exceptions in which serialization doesnot necessarily read and write to the stream. These are

1. Serialization ignores static fields, because they are not part of any particular object's state.
2. Base class fields are only handled if the base class itself is serializable.
3. Transient fields. There are four basic things you must do when you are making a class serializable.
They are:
1. Implement the Serializable interface.
2. Make sure that instance-level, locally defined state is serializedproperly.
3. Make sure that superclass state is serialized properly.
4. Override equals( )and hashCode( ).
it is possible to have control over serialization process. The class should implement Externalizable interface. This interface contains two methods namely readExternal and writeExternal. You should implement these methods and write the logic for customizing the serialization process .... (Source:
http://www.oreilly. com/catalog/ javarmi/chapter/ ch10.html)

What is meant by Endianness?

A2. Endianness describes how multiple data types such as short , int and long are stored in memory.If it takes two bytes to represent a short, then to predict if the most significant or the least significant comes first.If the most significant byte is first, followed by the least significant one then the machine is said to be big endian. Machines such as the SPARC and Power PC are big-endian,
while the Intel x86 series is little-endian.

Is JavaScript the same as Java?

NO! An Amazingly large number of people, including many web
designers, don't understand the difference between Java and
JavaScript. Briefly it can be summed up as follows: Java was
developed by Sun Microsystems. Java is a full-fledged object-oriented programming language. It can be used to create standalone applications and applet. Applets are downloaded as separate files to your browser alongside an HTML document, and provide an infinite variety of added
functionality to the Web site you are visiting. The displayed results of applets can appear to be embedded in an HTML page (e.g., the scrolling banner message that is so common on Java-enhanced sites),but the Java code arrives as a separate file.

JavaScript on the other hand was developed by Netscape, is a smaller and simpler scripting language that does not create applets or standalone applications. In its most common form today, JavaScript resides inside HTML documents, and can provide levels of interactivity
far beyond typically flat HTML pages -- without the need for
server-based CGI (Common Gateway Interface) programs. Some server software, such as Netscape's SuiteSpot, lets web application developers write CGI programs in a server-side version of JavaScript. Both client-side and server-side JavaScript share the same core JavaScript language, but each side deals with different kinds of objects. Client-side objects are predominantly the components of an
HTML web page (e.g., forms, text boxes, buttons). Server-side objects are those that facilitate the handling of requests that come from clients, as well as connectivity todatabases

Re: .NET framework interview questions [by Ravikiran]

Sat, 29 Dec 2007 07:20:10 +2230

Interview Questions:: .NET framework interview questions
kindly participate in posting faqs plzzzzzzz

Re: C faqs(questions&answers) [by Ravikiran]

Tue, 11 Dec 2007 20:35:40 +2230

Interview Questions:: C faqs(questions&answers)
1. What does extern mean in a function declaration?

A: It can be used as a stylistic hint to indicate that the
function's definition is probably in another source file, but there is no formal difference between
extern int f();
and
int f();

2: What's wrong with this initialization?
char *p = malloc(10); My compiler is complaining about an "invalid initializer",
or something.

A: Is the declaration of a static or non-local variable? Function calls are allowed only in initializers for automatic variables(that is, for local, non-static variables

3: What is the difference between these initializations?
char a[] = "string literal";
char *p = "string literal";

My program crashes if I try to assign a new value to p[i].

A: A string literal can be used in two slightly different ways. As an array initializer (as in the declaration of char a[]), it specifies the initial values of the characters in that array.Anywhere else, it turns into an unnamed, static array of characters, which may be stored in read-only memory, which is why you can't safely modify it. In an expression context, the array is converted at once to a pointer, as usual, so the second declaration initializes p to point to the unnamed array's first element.

enoy this joke hahaaaaaa [by Ravikiran]

Tue, 11 Dec 2007 13:04:17 +2230

Jokes Jokes..Just for Fun:: enoy this joke hahaaaaaa
This is a story from the Japanese Embassy in USA.

A few years ago, Prime Minister Mori was given some Basic Englishconversation training before he visited Washington and met presidentBill Clinton.

The instructor told Mori: "Prime Minister, when you shake hand withPresident Clinton, please say 'how are you'.Then Mr.Clinton should say,"I am fine, and you?"

Now you should say 'me too'. Afterwards we, translators, will do allthe work for you."

It looks quite simple, but the! truth is.... When Mori met Clinton, hemistakenly said "Who are you?". Mr. Clinton was a bit shocked but still managed to react with humour: "Well, I am Hilary's husband,ha..ha..ha.."

Then Mori replied confidently "Me too, ha..ha..ha.." Then there was along silence in the meeting room.

short funny story.........strong moral [by Ravikiran]

Tue, 11 Dec 2007 12:53:22 +2230

Jokes Jokes..Just for Fun:: short funny story.........strong moral
Hearing problem... a short story

A man feared his wife wasn't hearing as well as she used to and he thought she might need a hearing aid. Not quite sure how to approach her, he called the family Doctor to discuss the problem. The Doctor told him there is a simple informal test the husband could perform to give the Doctor a better idea about her hearing loss.

Here's what you do," said the Doctor, "stand about 40 feet away from her, and in a normal conversational speaking tone see if she hears you. If not, go to 30 feet, then 20 feet, and s o on until you get a response.

"That evening, the wife is in the kitchen cooking dinner, and he was in the den. He says to himself, "I'm about 40 feet away, let's see what happens." then in a normal tone he asks, 'Honey, what's for dinner?" No response. So the husband moves to closer to the kitchen, about 30 feet from his wife and repeats, "Honey, what's for dinner?" Still no response. Next he moves into the dining room where he is
about 20 feet from his wife and asks, Honey, what's for dinner?" Again he gets no response so; He walks up to the kitchen door, about 10 feet away. "Honey, what's for dinner?" Again there is no response. So he walks right up behind her.

"Honey, what's for dinner?" ;;;;"James, for the FIFTH time I've said, CHICKEN!"

brain teasers-sharps tour brain [by Ravikiran]

Sat, 08 Dec 2007 18:49:49 +2230

Interview Questions:: brain teasers-sharps tour brain
1. Tom's mom had three children. The first was named May, the second was
June. What was the third childs name?

2. The manufacturer doesn't want to use it, the buyer doesn't need to use it
and the user doesn't know he's using it. What is it?

3. The word CANDY can be spelled using just 2 letters. Can you figure out
how?

4. Bill bets Craig $100 that he can predict the score of the hockey game
before it starts. Craig agrees, but loses the bet. Why did Craig lose the
bet?

5. What is the next 3 letters in this sequence?
o t t f f s s _ _ _

6. FOUR is HALF of FIVE.
Is this statement True or False?

7. A woman shoots her husband.
Then she holds him under water for over 5 minutes.
Finally, she hangs him.
But 5 minutes later they both go out together and enjoy a wonderful dinner
together.
How can this be?

8. What do these 3 have in common?
Superman
Moses
The Cabbage Patch Kids

9. What is black when you buy it, red when you use it, and gray when you
throw it away?

10. Can you name three consecutive days without using the words Monday,
Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

11. I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole,
What am I?

12. This is an unusual paragraph. I'm curious how quickly you can find out
what is so unusual about it? It looks so plain you would think nothing was
wrong with it! In fact, nothing is wrong with it! It is unusual though.
Study it, and think about it, but you still may not find anything odd. But
if you work at it a bit, you might find out! Try to do so without any
coaching!

13. Hi! Ma and Pa told me I'd better say that all the two-letter words in
this paragraph have something in common ...... or else! What's the common
factor here?

14. What falls but never breaks?
What breaks but never falls?

15. This one's a tuffy! There is a common English word that is seven letters
long. Each time you remove a letter from it, it still remains a common
English word - from seven letters right on down to a single letter. What is
the original word, and what are the words that it becomes after removing a
letter at a time?

16. In olden days you are a clever thief charged with treason against the
king and sentenced to death. But the king decides to be a little lenient and
lets you choose your own way to die. What way should you choose? Remember,
you're clever!

17. What is it that when you take away the whole, you still have some left
over?

18. What six letter word in the English language contains ten other words
without rearranging any of its letters?

19. Name an English word of more than 2 letters that both begins and ends
with the letters "he" in that order. There are two possible answers. "hehe"
is not acceptable.

20. A man was found murdered on Sunday morning. His wife immediately called
the police. The police questioned the wife and staff and got these alibis:
The Wife said she was sleeping.
The Cook was cooking breakfast.
The Gardener was picking vegetables.
The Maid was getting the mail.
The Butler was cleaning the closet.

The police instantly arrested the murdered. Who did it and how did they
know?

hope iam expecting nice solutions from you..............

love with software girl - too funny naaaa [by Ravikiran]

Sat, 08 Dec 2007 18:40:24 +2230

Jokes Jokes..Just for Fun:: love with software girl - too funny naaaa
Never LOVE a Software Girl

�Never marry a Testing girl since she always doubts U

�Never marry a DATABASE girl since she always wants her husband to be a UNIQUE key.

�Never marry a C girl because she always have a tendency to BREAK the things and EXIT from house.

�Never marry a C++ girl as u may encounter some problems in INHERITANCE.

�Never marry a JAVA girl since she always throws EXCEPTIONS

.Never marry a VB girl since she has divorce FORM with her always.

�Never marry a UNIX girl ,she always dump u with a core.

�Never marry a PASCAL girl ,she always scolds u as rascal.

�Never marry a COBOL girl since she may be very good in DIVISION of families.

�Never marry a NETWORK girl since she may be very good in shooting troubles.

funny interview at some [by Ravikiran]

Sat, 08 Dec 2007 18:31:25 +2230

Jokes Jokes..Just for Fun:: funny interview at some
Read it and enjoy..........

Interviewer: Tell me about yourself.

Candidate: I am Kondesh Kulkarni. I did my Tele Communication engineering from BabanRao Dhole-Patil Institute of Technology.

Interviewer: BabanRao Dhole-Patil Institute of Technology? I had never heard of this college before!

Candidate: Great! Even I had not heard of it before getting an admission into it . What happened is - due to cricket world cup I scored badly in 12th.I was getting a paid seat in a good college. But my father said (I prefer to call him 'baap') - "I can not invest so much of money".(The baap actually said - "I will never waste so much of money on you"). So I had to join this college. Frankly
speaking this name - BabanRao Dhole-Patil, can at the most be related to a Shetakari Mahavidyalaya.

Interviewer: ok, ok. It seems you have taken 6 years to complete your engineering.

Candidate : Actually I tried my best to finish it in 4 years. But you know , these cricket matches and football world cup, and tennis tournaments..It is difficult to concentrate. So I flunked in 2nd and 3rd year. So in all I took 4 + 2 = 7 years.

Interviewer: But 4+2 is 6.

Candidate: Oh, is it? You know I always had KT in maths. But I will try to keep this in mind. 4+2 is 6, good, thanks. These cricket matches really affect exams a lot. I think they ! should ban it.

Interviewer : Good to know that you want cricket matches to be banned.

Candidate: No, no.. I am talking about Exams!!

Interviewer: Ok, What is your biggest achievement in life?

Candidate: Obviously, completing my Engineering. My mom never thought I would complete it. In fact, when i flunked in 3rd year, she was looking for a job for me in BEST(Bus corporation in Maharashtra ) through some relative ..

Interviewer: Do you have any plans of higher study?

Candidate: he he he.. Are you kidding? Completing 'lower' education itself was so much of pain!!

Interviewer: Let's talk about technical stuff. On which platforms have you worked?

Candidate: Well, I work at SEEPZ, so you can say Andheri is my current platform . Earlier I was at Vashi center. So Vashi was my platform then. As you can see I have experience of different platforms ! (Vashi and Andheri are the places in Mumbai)

Interviewer: And which languages have you used?

Candidate: Marathi, Hindi, English. By the way, I can keep quiet in German, French, Russian and ma! ny other languages.

Interviewer: Why VC is better than VB?

Candidate: It is a common sense - C comes after B. So VC is a higher version than VB. I heard very soon they are coming up with a new language VD!

Interviewer : Do you know anything about Assembly Language?

Candidate : Well, I have not heard of it. But I guess, this is the language our ministers and MPs use in assembly ..

Interviewer: What is your general project experience?

Candidate: My general experience about projects is - most of th! e times they are in pipeline!

Interviewer: Can you tell me about your current job?

Candidate: Sure, Currently I am working for Bata InfoTech ltd. Since joining BIL, I am on Bench. Before joining BIL, I used to think that Bench was another software like Windows.

Interviewer: Do you have any project management experience?

Candidate: No, but I guess it shouldn't be difficult. I know Word and Excel. I can talk a lot. I ! know how to dial for International phone call and use speaker facility. And very important - I know few words like - 'Showstoppers ' , 'hotfixes', 'SEI-CMM','quality','versioncontrol','deadlines' , 'Customer Satisfaction' etc. Also I can blame others for my
mistakes!

Interviewer: What are your expectations from our company?

Candidate: Not much.
1. I should at least get 40,000 in hand.
2. I would like to work on a live EJB project. But it should not have deadlines. I personally feel that pressure affects natural talent.
3. I believe in flexi-timings.
4. Dress code is against basic freedom, so I would like to wear t-shirt and jeans.
5. We must have sat-sun off. I will suggest wednesday off also, so as to avoid breakdown due to overwork.
6. I wo! uld like to go abroad 3 times a year on short term preferably 1-2 months) assignments. Personally I prefer US, Australia and Europe . But considering the fact that there is a world cup in West Indies in 2007,I don't mind going there in that period . As you can see I am modest and don't have many expectations. So can I assume my selection?

Interviewer: he he he ha ha ha. Thanks for your interest in our organization. In fact I was never entertained so much before. ..) We look forward to working with you .. welcome to Infosys